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ONT Notes - Pre-classify and End-to-end QoS

* VPNs (Didn’t ISCW cover this?) * Provide * Confidentiality * Integrity * Authentication * Types * Remote-access * Client-initiated * NAS-initiated * Site-to-site * LAN-to-LAN * Extranet * L3 Tunneling protocols * GRE * IPSec * Pre-classify allows traffic to be classified before being sent across a tunnel or crypto-ed. * qos pre-classify * Provide

ONT Notes - Congestion Avoidance, Policing, Shaping, and Link Efficiency

* Tail drop drawbacks * TCP synchronization – Dropping TCP packets from different flows can cause them all to window down and back up again at the same time in cycles. * TCP starvation – Non-TCP or aggressive flows can starve everyone else out when TCP throttles back. * No differentiated drop – Tail drop doesn’t

Migrating CSM Serverfarms to Other Server VLANs

A coworker brought an interesting problem to me the other day. He wanted to move a serverfarm from one server VLAN to another without taking an outage. Since I didn’t want to have to come into the office late at night to do work, I decided to see what

ONT Notes - Queuing

Here are some more notes from my studies. Of course, no one cares about them but me, but it’s my blog. I’m sure someone will find it useful. Please help to correct dumbass mistakes. * Congestion * Speed mismatch – traffic leaves a lower-bandwidth interface than the one it came in

ONT Notes – Classification, Marking, and NBAR

Here’s another set of notes from my ONT studies. I’m sure someone will find it useful. Please help to correct dumbass mistakes. * Classification is done with traffic desriptors * Ingress interface * CoS value on ISL or 802.1P frames * Source/destination IP address * IP Precedence or DSCP value * MPLS

ONT Notes - Intro to QoS

I’ll try to keep it a little shorter this time. Major issues for converged enterprise networks * Available bandwidth: competition among applications * Fixes * Increase bandwidth: More power! * Properly queue based on classification and marking: QoS * Compress: cRTP, TCP header compression, etc. * Delay: Lead time to get a packet to the

ONT Notes - VOIP Networks

Here are some of the notes I’ve been taking while reading over the ONT book. I hope it benefits somebody. Feel free to correct any stupid mistakes as a paraphrase to avoid a lawsuit. There’s way too much info here. I’ll refine the process a little better